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import pytest
import asyncio
import operator
from aiostream import stream, pipe
from aiostream.test_utils import add_resource
@pytest.mark.asyncio
async def test_accumulate(assert_run, assert_cleanup):
with assert_cleanup():
xs = stream.range(5) | add_resource.pipe(1) | pipe.accumulate()
await assert_run(xs, [0, 1, 3, 6, 10])
with assert_cleanup():
xs = (
stream.range(2, 4)
| add_resource.pipe(1)
| pipe.accumulate(func=operator.mul, initializer=2)
)
await assert_run(xs, [2, 4, 12])
with assert_cleanup():
xs = stream.range(0) | add_resource.pipe(1) | pipe.accumulate()
await assert_run(xs, [])
async def sleepmax(x, y):
return await asyncio.sleep(1, result=max(x, y))
with assert_cleanup() as loop:
xs = stream.range(3) | add_resource.pipe(1) | pipe.accumulate(sleepmax)
await assert_run(xs, [0, 1, 2])
assert loop.steps == [1] * 3
@pytest.mark.asyncio
async def test_reduce(assert_run, assert_cleanup):
with assert_cleanup():
xs = stream.range(5) | add_resource.pipe(1) | pipe.reduce(min)
await assert_run(xs, [0])
with assert_cleanup():
xs = stream.range(5) | add_resource.pipe(1) | pipe.reduce(max)
await assert_run(xs, [4])
with assert_cleanup():
xs = stream.range(0) | add_resource.pipe(1) | pipe.reduce(max)
await assert_run(xs, [], IndexError("Index out of range"))
@pytest.mark.asyncio
async def test_list(assert_run, assert_cleanup):
with assert_cleanup():
xs = stream.range(3) | add_resource.pipe(1) | pipe.list()
# The same list object is yielded at each step
await assert_run(xs, [[0, 1, 2], [0, 1, 2], [0, 1, 2], [0, 1, 2]])
with assert_cleanup():
xs = stream.range(0) | add_resource.pipe(1) | pipe.list()
await assert_run(xs, [[]])
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